How can I filter some content added dynamically with jQuery?

First of all, sorry for my english, I'm still learning :).

My problem is the next, I have added some HTML content dinamically with jQuery, specifically these inputs:

<td id="date"><input type="text" id="input_1" class="select" /></td>
<td id="date"><input type="text" id="input_2" class="select" /></td>
<td id="date"><input type="text" id="input_3" class="select" /></td>
<td id="date"><input type="text" id="input_4" class="select" /></td>
<td id="date"><input type="text" id="input_X" class="select" /></td>

The number of inputs depends how many register I have in my DB.

For the another hand, I have this code in jQuery that I used with the same content but it wasn't added dynamically. I tried to execute this script after add the content above:

$('input')
    .filter(function() {
    return this.id.match(/input_./);
})
.foo({
    ....
});

When I try to apply the same script with the dynamically content it doesn't work, it doesn't match anything.

I read about delegate() and live() method but I didn't understand how can use them in my situation because all the examples I saw it was for handlers events.

Anybody knows how can I solve this problem.

Thanks in advance.

$(document).on('change', 'input[id^=input_]', function() {
    /* Do stuff */
});

So you could do something like this demo

// Wrap inside a document ready
// Read .on() docs (To ensure the elements...bla bla)
$(document).ready( function () {

    input_index = 0;

    setInterval(addInput, 1000);

    $(document).on('change', 'input[id^=input_]', function() {
        $(this).val($(this).attr('id'));
    });

    function addInput () { 
        $('<input type="text" id="input_'+input_index+'"/>')
          .appendTo('#empty')
          .change();   // <============================ Pay attention to this
        input_index++;
    }

});